18066617155 has 4 divisors (see below), whose sum is σ = 21679940592. Its totient is φ = 14453293720.

The previous prime is 18066617119. The next prime is 18066617167. The reversal of 18066617155 is 55171666081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18066617155 - 2¹¹ = 18066615107 is a prime.

It is a super-3 number, since 3×18066617155³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806661711 + ... + 1806661720.

It is an arithmetic number, because the mean of its divisors is an integer number (5419985148).

Almost surely, 2^18066617155 is an apocalyptic number.

18066617155 is a deficient number, since it is larger than the sum of its proper divisors (3613323437).

18066617155 is an equidigital number, since it uses as much as digits as its factorization.

18066617155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613323436.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 18066617155 in words is "eighteen billion, sixty-six million, six hundred seventeen thousand, one hundred fifty-five".